Rinse and cut potatoes into bite size pieces. Place into large pot and cover with water.
Bring to a boil and boil for 15 minutes, or until easily pierced with fork.
dump water and let potatoes cool at least 10 minutes.
While potatoes are cooling, thinly slice green onion and celery.
Place potatoes into a large glass or metal bowl, add in celery, onion, mayo, and celery seed. Stir gently until potatoes are evenly covered.
Taste. If you feel it needs salt and pepper, add 1/4 tsp at a time until you get desired flavor.
added note: it's never a bad idea to use less salt and let others add their own later on. Some people like more salt than others and you can't unsalt food!